Add `categories` and `keywords` fields to the `Cargo.toml`s of runtime crates and generated SDKs

### Describe the issue

Per @kornelski's [request](https://gitlab.com/crates.rs/crates.rs/-/issues/117#note_1220777282):
> "It would be very helpful if these crates had relevant keywords and categories fields. Currently I have to scrape the readme to guess keywords, and that ends up repetitive and sometimes inaccurate."

Start by locating the Cargo.toml manifests for the runtime crates and generated SDKs, then compare their existing package metadata with the crates.io categories and keywords requirements. Done means every in-scope manifest has relevant categories and keywords, including generated SDK output; verify this by inspecting the manifests and generation results.

Written by the indexing model from the issue text.